One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,13)(15,16)(17,18)(19,23)(20,24)(21,25)(22,26)(27,41)(28,36)(29,37)(30,38)(31,39)(32,40)(33,43)(34,44)(35,45)(42,47)(46,48) involution — undirected(2,5)(6,8)(17,19)(18,23)(20,28)(21,27)(22,34)(24,36)(25,41)(26,44)(29,33)(30,32)(31,45)(35,39)(37,43)(38,40)(42,48)(46,47) involution — undirected(1,3)(2,6)(4,7)(5,8)(10,13)(14,16)(18,24)(19,27)(21,33)(22,32)(23,35)(25,42)(28,45)(29,30)(31,47)(34,46)(36,41)(37,44)(38,48)(39,43) involution — undirected(3,7)(6,8)(9,11,12,15)(10,14,13,16)(18,24)(23,36)(25,39)(26,40)(35,41)(37,48)(38,44)(42,43)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.